golang issue47708 代码
文件路径：/test/typeparam/issue47708.go
/ run
/ Copyright 2021 The Go Authors. All rights reserved.
/ Use of this source code is governed by a BSD-style
/ license that can be found in the LICENSE file.
package main
type FooType[T any] interface {
Foo(BarType[T]) string
}
type BarType[T any] interface {
Bar(FooType[T]) string
}
/ For now, a lone type parameter is not permitted as RHS in a type declaration (issue #45639).
/ type Baz[T any] T
/ func (l Baz[T]) Foo(v BarType[T]) string {
/ return v.Bar(l)
/ }
/ type Bob[T any] T
/ func (l Bob[T]) Bar(v FooType[T]) string {
/ if v,ok := v.(Baz[T]);ok{
/ return fmt.Sprintf("%v%v",v,l)
/ }
/ return ""
/ }
func main() {
/ For now, a lone type parameter is not permitted as RHS in a type declaration (issue #45639).
/ var baz Baz[int] = 123
/ var bob Bob[int] = 456
/
/ if got, want := baz.Foo(bob), "123456"; got != want {
/ panic(fmt.Sprintf("got %s want %s", got, want))
/ }
}